Pipe or nut wrench



(No Model.)

D. P. FOSTER.

PIPE 0R NUT WRENCH. No. 282,298. Patented July 31.1883.

REEL E32. F15 3. H5 4- WIIFlEEEEE.

TERS. Mela-Lithographer. Waahingmn. n c.

DAN r. rosrnn, or WALTHAM, MASSACHUSETTS.

PIPEhOR NUT WRENCH.

SPECIFICATION formingpart of Letters Patent No. 282,298, dated July 31, 1888. Application filed December 1 6, 1852. No model.)

useful Improvements in Pipe or Nut Wrenches;

and I do hereby declare that thefsame are fully described in the fol-lowing specification j which the wrench is to be put.

and illustrated in the accompanying drawings.

This invention relates to improvements in pipe or nut wrenches; and it is carried out as follows, reference being had to the accompanying drawings, where- Figure 1 represents a side elevatiomand Fig. 2a longitudinal section, of the improved wrench. Fig. 3 represents a front view, and Fig. 4. represents a rear view, of the same. Fig. 5 represents a crosssection on the line A B, shown in Fig. 2. I Similar letters refer to different parts wherever'they occur on the different parts of the drawings.

The wrench is composed of the stationary jaw a, with its shank ct and handle a, and the movable jaw b, with its screw-threaded shank b, as shown. plain or serrated, according to the uses to To the rear of the stationary jaw a is rigidly affixed or made in one piece with it, the slotted guide 0 for the shank b' of the movable jaw b, as shown in Figs. 1, 2, and 5. I11 addition to the rigid guide-piece a, I hinge at d, to the stationary jaw a or its shank, the'movable guide (I, which is also slotted in its rear end, so as to serve as I a guide or bearing forthe lower end of the shank b of the movable jaw b, as shown. The

. movable guide (1 extends in front of the stationary shank a as a thumb-piece, cl", which is normally acted on by the springe, secured in its upper end to the front of the stationary jaw a, and having its lower free end pressing on the inside of the thumb-pieced, so as to automaticallyholdthe swinging guide (Z, shank b, and its jaw b in their relative positions to the stationary jaw a and its shank a, as shown in Figs. 1 and 2, when the wrenchis not in use. The rearof the stationary jaw a has a downward-projecting fulcrum edge or projec- Both jaws may be madetion, a, against which the correspondinglygrooved washer b is brought to bear as the screw-threaded shank b is moved upward by means of the serrated thumb-nut b, which latter surrounds the shank b and has its under side supported on the pin or projection f, secured to or made in one piece with the rear of the stationary shank a, which pin or pro j ection serves to bring the nut 12'. back to its normal position when the grip of the jaw is released, and the spring 0 causes the movable guide d and shank b to swing to the position shown in Figs. 1 and 2. The pin or projection f is made long enough to prevent the nut b' from dropping off it when the thumb-piece d is brought to a stop against the shank a. t

In using the wrench the movable jaw I) is first adjusted by means of turning the nut b, so that the object to be grasped may easily be introduced between the jaws a and I), after which the operator takes hold of the handle a, and with his thumb presses the thumb piece (1 toward the shank a, causingthe movable jaw 12 to turn on the stationary fulcrum a and to close upon the object to be grasped. Simultaneously with depressing the thumbpieced the operator moves the handle a in the direction shown by arrow inFig. 2, by

' PATENT OF ICE. 1 i a which avery firm grip is obtained by the. j aws a 12 upon the object to be turned, which grip is instantaneously released the moment the handle a is moved in an opposite direction to that shown by arrow in i Fig. 2, the spring a causing the grooved washer b and the shank b, with its jaw 12, to turn on the fulcrum a to the position shown in Figs. 1 and 2, and thus automatically to expand the jaws a b from each other and releasing their hold on the obect. J It will be seen that no strain whatever comes on the stationary guide 0 or movable guide (I in using the wrench, but is transferred from the stationary jaw a and its fulcrum a to the washer b, nut b, and screw-threaded shank b, and its jaw b, as fully shown and hereinabove described.

What I wish to secure by Letters Patent, and claim, is' I 7 The herein-described. pipe'or nut Wrench, In testimony whereof I have affixed my sigconsisting of the stationary jaw a, its shank a], nature in presence of two Witnesses. fulcrum a, stationary guide 0, and hinged guide d, with its thumb-pieces dflztnd spring DAN P. FOSTER. 5 e, in combination with the movable j aw 6, its

screw-threaded shank b, notched washer b, Witnesses:

nut b, and supporting-pin f, as and for the ALBAN ANDREN, purpose set forth.

HENRY CHADBOURN. 

